... installation and change-out.1.Micron ratings from 0.5 to 1500 microns ... to suit your application. 2.Standard felt bag materials include polypropylene, polyester, nylon, nomex, PPS,PTFE or ... constructed of nylon monofilament, polyester monofilament,or polyester multi-filament material. 4.Custom ... Ring , Polypropylene Ring , Nylon Ring. Sewing or Welded. Size#1: 7" *161/2" Size#2: 7 ...